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You can adjust the humidity level by opening the lid a little bit, but its difficult to control it this way. A much easier way of controlling the humidity is to adjust the water level in your perlite. If you have a thicker layer of exposed wet perlite, then your humidity will be higher. If you find that your humidity is too high, then just add more water. This will leave less moist perlite surface area in contact with the air and therefore lower the humidity. I don't have any experience with casings, but I'm pretty sure they're supposed to have less humidity than cakes.

I use a rubbermaid container and perlite for humidification. I find that fanning them 3 or so times a day is sufficient and the humidity isn't too high. I also live where there is a lot of natural humidity.

I'm also using a large rubbermaid container. I put my perlite in several foil baking pans and laid them in my terrarium. This way I can adjust the humidity by adding or removing baking pans, while also keeping things a little less messy. Like Vorpal said, casings require less humidity than cakes. Upper 90's is fine for cakes. If you have casings, than you will want 90%to95% humidity. For a cover I use a thin plastic sheet draped over my terrarium. I also live in Florida where the humidity is high, so where your living can also play a factor.

I would follow Mr. Wicky's advice here.You don't need lots of perlite, and it's a good idea to put it in one or more baking pans or shallow tupperwares. My aquarium is about 16 gallons, and I only use 1 square tupperware, about 8 x 8 inches, some 5 inches deep. Gets me an easy 95% humidity (with a rather low temp however).